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Magnepans

I'm kinda new to the plannar/magnepan world, but I am really interested in trying out a pair after all the reviews I've been reading. From what I understand these speakers are quite power hungry. What is the minimum I need to properly drive these? 
I currently have a VAC Avatar integrated tube amp. These are the stats:
Type: Integrated vacuum tube amplifier with MM phono stage and home theater (direct power amplifier) mode.
Tube Complement: two 12AX7 low noise (phono), two 12AX7 (line stage), three 12AU7/6189A (power amplifier), and four EL34 (power amplifier)
Options: Remote control for volume (motorized direct control) & mute
Power amplifier ("Home Theater" direct mode):
Output matching: 4 or 8 ohms nominal
Power output: 60 watts/channel ultra-linear; 27 watts/channel triode
Frequency response: 9 Hz - 35 kHz +0 / -0.5 dB, 3 Hz - 71 kHz +0 / -3.0 dB
Power bandwidth: 11 Hz - 63 kHz + 0 / -3.0 db ref. 50 watts
Gain: 25 dB ultra-linear; 23 dB triode
Residual noise: 1.5 mv at 8 ohm output
Channel separation: -72 dB @ 1 kHz; -60 dB @ 10 kHz
Line stage preamplifier:
Gain: 24 dB
Maximum input signal: Infinite (attenuation precedes line stage)
Noise contribution: Approx. 0.1 mv at power amplifier output 
THD contribution: Approx. 0.04% 
Tape output: Unity gain from selector, non-inverting 
Phono stage preamplifier: 
Gain: 37 dB (measured at tape output)
MC phono stage in place of the MM optional 
Residual noise: 3 mv at output (S/N ratio approx. 69 dB) 
Overload: 117 mv @ 1 kHz = 8 volts RMS output, 460 mv @ 10 kHz 
Frequency response: RIAA +/- 0.25 dB 
Notes: Does not invert absolute phase. 

Anyone know if these will do or if I'll have to upgrade? Love the tube sound . . . will I need to go solid state for Maggies? Thanks for putting up with the noobie question :) 
the_nature_boy
the_nature_boy OP
21 posts
 
Thanks for all the great info, guys! A lot of really good options to think about. 
Anyone else hear about SERVO amps working well with these speakers? 
stewart0722
184 posts
 
I've used multiple amps on Mag 3.7s over the last few years.....

The best amps are the ones I have now, Bryston 28BSST2
runner up, Bryston 7BSST2
after that in order of "best sound"
Pass X350.5
Zesto Eros (I have a semi large room, and even these class A beasts seemed to run out of gas with the 3.7s)
Manley Neos (By far the worst sounding amps I've ever heard.....I cannot BELIEVE any person with average ears would keep these)  also ran out of gas quickly....

I do not believe tubes in general are a good fit for the Magnepans.
I do love a tube pre with them though, I run Convergent SL1 Renaissance w/ Phono

Magnepan has presented at the shows for years w/ Bryston, and I do think they are the top of the mark in terms of synergy.....I have excellent bass control, decent low end, sparkling highs and a meaty musical involving presentation with this combination.......you need a lot of juice with Magnepans to give them the headroom that you'll want.....

I've put some vids on utube, just search Magnepan Convergent
kemurrays
5 posts
 
food for thought......I am pushing the 20.7's with the Devialet Expert Pro 1000's .  These are hybrid class A/D technology and I could not get Magnepan to provide an opinion.....but comparing to other amps i have owned IMO they sound the best they ever have......  using the Berkeley Ref DAC to drive.....so that may be helping greatly.......

noble100's avatar
noble100
2,419 posts
 
stewart10722,

     I agree that the Bryston  28BSST2  mono-block amps would probably be the best sounding amps for Natureboy's 2.5 speakers.      
     The bad news is that a pair of these mono-blocs new were about $15,000  (Natureboy didn't state his budget but I assumed it wasn't unlimited), they're huge and weigh about 100 lbs/ each, are very inefficient and emit a tremendous amount of heat.

     Good class D mono amps (such as Wyred, Bel Canto or D-Sonic), in the opinion of 6Moons reviews, are about 90% as good at 1/4 the price or less. Plus they're small, weigh about 10 lbs/each, are very efficient and emit very little heat.  

     Natureboy will need to decide which factors are most important to him.

Tim 



     

  
hasse
230 posts
 
The best amps are the ones I have now, Bryston 28BSST2
runner up, Bryston 7BSST2
after that in order of "best sound"
Pass X350.5
Stewart, how would you describe the sonic difference between the 7BSST2 and the Pass 350.5? I am toying with the idea of  buying either the 7B3´s or a Pass 250/350.8 for my 3.7´s.
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